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A Ford Fusion development vehicle equipped with autonomous controls, seen at a test facility Tuesday in Ann Arbor, Mich. Jeff Kowalsky/AFP/Getty Images hide caption

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Jeff Kowalsky/AFP/Getty Images

United Airlines garnered headlines in April when a passenger was dragged off a plane after the airline attempted to bump him from the flight. Marcio Jose Sanchez/AP hide caption

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Marcio Jose Sanchez/AP

Secretary of Transportation-designate Elaine Chao testifies at her confirmation hearing before the Senate Commerce, Science and Transportation Committee. Listening are her father, James Chao, left, and husband, Senate Majority Leader Mitch McConnell. Zach Gibson/AP hide caption

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Zach Gibson/AP

Elaine Chao arrived at Trump Tower last week to meet with President-elect Donald Trump. On Tuesday, he announced she was his pick to lead the Department of Transportation. Eduardo Munoz Alvarez/AFP/Getty Images hide caption

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Eduardo Munoz Alvarez/AFP/Getty Images

E-cigarette vaporizers are displayed at Digital Ciggz in San Rafael, Calif. The Department of Transportation says you definitely can't use this or anything else to vape on a plane. Justin Sullivan/Getty Images hide caption

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Justin Sullivan/Getty Images